Astronomy Crossword

a scale for measuring the actual brightness of a celestial object without accounting for the distance of the object. measures how bright an object would appear if it were 10 parsecs (33 light years) away from earth.
a disk of gas that accumulates around a center of gravitational attraction, like a white dwarf, neutron star, or black hole. as the gas spirals in, it becomes hot and emits light or even x-rays.
indicates that an object is moving toward the observer. the larger the _____, the faster the object is moving.
a unit of measure of atmospheric pressure.
the theory that suggests that the universe was formed from a single point in space during a cataclysmic explosion about 13.7 billion years ago.
an imaginary sphere around the earth on which the stars and planets appear to be positioned.
the outer part of the sun's atmosphere. visible from earth during total solar eclipses.
atomic nuclei (mostly protons) that are observed to strike the earth's atmosphere with extremely high amounts of energy.
a bowl-shaped depression formed by the impact of an asteroid or meteoroid.
a term used to describe matter in the universe that cannot be seen, but can be detected by its gravitational effects on other bodies.
a celestial body orbiting the sun that is massive enough to be rounded by its own gravity but has not cleared its neighboring region of planetesimals and is not a satellite.
when one celestial body passes into the shadow of another.
the angle between the sun and a planet, with earth as the reference point.
the speed required for an object to escape the gravitational pull of a planet or other body.
the invisible boundary around a black hole past which nothing can escape the gravitational pull- not even light.
a term used to describe anything that does not originate on earth.
a faint red star that appears to change in brightness due to explosions on its surface.
a large grouping of stars. they are found in a variety of sizes and shapes.
a mutual physical force of nature that causes two bodies to attract each other.
an astronomical unit of measure equal to the distance light travels in a year, approximately 5.8 trillion miles